Complete reinforced and upgraded Gearbox M100 for Marui M4A1 / M4RIS / S-System
For battery in front
The approximate velocity with a 0.2 gram BB's: 360 fps
- M100 Spring
- Reinforced 6mm gearbox
- Reinforced cyinder set (Bearing piston head & CNC made cylinder head)
- Reinforced Titanium Piston V.2
- Reinforced spring guide
- Reinforced Titanium Standard Torque gears
For installing all mechanics gearbox parts we recommended to use professional services!
If you decide on a home made installation of any gearbox parts it is equal with losing your warranty on a given part!
The warranty on gearbox parts is valid when a given part was installed by our authorized service. We remind that when a replica was bought in our shop, the installation of parts is free.
All parts (e.g. gearbox or external parts) bought and installed in our service contain
the 3-month warranty.